3791: At what temperature are the readings of a Centigrade and Fahrenheit thermometer the same?
(a) -40
(b) 212
(c) 40
(d) 100
3792: In the context of proposals to the use of hydrogen-enriched CNG (H-CNG) as fuel for buses in public transport, consider the following statements:
1. The main advantage of the use of H-CNG is the elimination of carbon monoxide emissions.
2. H-CNG as fuel reduces carbon dioxide and hydrocarbon emissions.
3. Hydrogen up to one-fifth by volume can be blended with CNG as fuel for buses.
4. H-CNG makes the fuel less expensive than CNG.
Which of the statements given above is/are correct?
(a) 1 only
(b) 2 and 3 only
(c) 4 only
(d) 1, 2, 3 and 4
3793: A boy carved his initials on the-bark of a tree at a height of 2.5 m above the ground when the tree was 5 m tall. In 10 years the tree attained a height of 15 m. The initials carved by the boy 10 years ago will now be found:
(a) At 2.5 m above the ground
(b) At 7.5 m above the ground
(c) At 12.5 m above the ground
(d) At 15.0 m above the ground
3794: Which one of the following is not essentially a species of the Himalayan vegetation ?
(a) Juniper
(b) Silver fir
(c) Mahogany
(d) Spruce
3795: The oldest monarchy in the world is that of
(a) U.K.
(b) Nepal.
(c) Saudi Arabia
(d) Japan